feat(form): new default true for errorfocus

As proposed in #1745 (comment) this PR changes the default value for errorFocus to true.
The new default will always focus the first error field of a form when the form is invalid, which is more logical. By the previous Logic to adjust a form field content, you almost always have to click into that field first.

As this is a breaking change it is supposed to be part of 2.9

Author: lubber-de

src/definitions/behaviors/form.js

@@ -1527,7 +1527,7 @@ $.fn.form.settings = {
 
   autoCheckRequired : false,
   preventLeaving    : false,
-  errorFocus        : false,
+  errorFocus        : true,
   dateHandling      : 'date', // 'date', 'input', 'formatter'
 
   onValid           : function() {},